Covalent Allosteric Inactivation of Protein Tyrosine Phosphatase 1B (PTP1B) by an Inhibitor–Electrophile Conjugate
作者:Puminan Punthasee、Adrian R. Laciak、Andrea H. Cummings、Kasi Viswanatharaju Ruddraraju、Sarah M. Lewis、Roman Hillebrand、Harkewal Singh、John J. Tanner、Kent S. Gates
DOI:10.1021/acs.biochem.7b00151
日期:2017.4.11
Protein tyrosine phosphatase 1B (PTP1B) is a validated drug target, but it has proven difficult to develop medicinally useful, reversible inhibitors of this enzyme. Here we explored covalent strategies for the inactivation of PTP1B using a conjugate composed of an active site-directed 5-aryl-1,2,5-thiadiazolidin-3-one 1,1-dioxide inhibitor connected via a short linker to an electrophilic α-bromoacetamide
蛋白酪氨酸磷酸酶1B(PTP1B)是一种经过验证的药物靶标,但是事实证明很难开发出可药用的,可逆的该酶抑制剂。在这里,我们探索了使用共轭策略使PTP1B失活,该共轭策略是使用由活性位点定向的5-芳基-1,2,5-噻二唑啉-3-酮1,1,1-二氧化物抑制剂通过短接头与亲电α连接而成的。 -溴乙酰胺部分。抑制剂-亲电偶联物5a导致PTP1B活性随时间的丧失,与共价灭活机制一致。失活发生的二级速率常数为(1.7±0.3)×10 2 M –1分钟–1。灭活酶的质谱分析表明,修饰的主要位点是C121,一个远离活性位点的残基。先前的工作提供了变构残基C121的共价修饰可导致PTP1B失活的证据[Hansen,SK,Cancilla,MT,Shiau,TP,Kung,J.,Chen,T.,and Erlanson,DA(2005)Biochemistry 44, 7704–7712]。总的来说,我们的结